These wristbands really work if you want to "wipe your brow" without carrying a towel around on the court. Of course they are great for keeping the sweat from running down your arm onto your hands.
I was looking for a wide sweatband for my wrist and this was perfect.
I like to use these for tennis. The only downfall, but would also be the case for any sweatband, is that they get very heavy when wet. I try to change it after each set. The definitely help your hand stay dry and are great for drying your brow.